Answer this question truthfully
### Question: What causes Behcet's syndrome?
### Response: Nearly all of the symptoms of Behçet's disease are due to an inflammation of the blood vessels. Doctors aren't sure what causes this inflammation. Some people may have inherited (passed on from parent to child) a problem with the immune system that makes them more likely to develop the disease. For these people, contact with substances in the environment, such as bacteria or viruses, may cause the immune system to attack the blood vessels. Behçet's disease is not contagious; it is not spread from one person to another.